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Fossil nematodes occur in amber found in the La Quinta Formation (Late Oligocene) of the southern Mexican state of Chiapas. This amber is around 25 million years old and was deposited in marine sediments during the late Oligocene epoch. Breeding populations of a member of Aphelenchoididae are described as Oligaphelenchoides atrebora n. gen., n. sp. Two specimens which appear to represent males in the family Diplogasteridae are described as Oligodiplogaster antiqua n. gen., n. sp. A third species which is considered microbivorous (free-living) is described as robustus n. sp. in the fossil genus Vetus Taylor.
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George O. Poinar (1977) studied this question.
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